*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #080B12;
  --surface:  #101622;
  --surface2: #0C111A;
  --border:   #1E2D3D;
  --blue:     #3B82F6;
  --violet:   #7C5CFC;
  --text:     #E2E8F0;
  --muted:    #64748B;
  --green:    #22C55E;
  --font:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:     'JetBrains Mono', 'Fira Code', monospace;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1100px 480px at 50% -120px, rgba(59,130,246,0.10), transparent 70%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.gradient {
  background: linear-gradient(135deg, #3B82F6, #7C5CFC);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(8,11,18,0.78); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 9px; }
.logo-wordmark { font-size: 18px; font-weight: 700; letter-spacing: -0.02em; }
.logo-open { color: var(--text); } .logo-thunder { color: var(--blue); } .logo-dev { color: var(--muted); font-weight: 500; }
.header-nav { display: flex; align-items: center; gap: 22px; }
.header-nav a { font-size: 14px; color: var(--muted); transition: color .15s; }
.header-nav a:hover { color: var(--text); }
.header-cta {
  padding: 7px 14px; border: 1px solid var(--border); border-radius: 8px; color: var(--text) !important;
}
.header-cta:hover { border-color: var(--blue); }
@media (max-width: 720px) { .header-nav a:not(.header-cta) { display: none; } }

/* Hero */
.hero { padding: 72px 0 40px; text-align: center; }
.eyebrow {
  display: inline-block; font-family: var(--mono); font-size: 12px; color: var(--blue);
  border: 1px solid var(--border); border-radius: 999px; padding: 5px 14px; margin-bottom: 22px;
  background: var(--surface2);
}
.hero h1 { font-size: clamp(34px, 6vw, 56px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.08; }
.hero-sub { max-width: 600px; margin: 18px auto 28px; font-size: 17px; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 16px; font-size: 13px; font-family: var(--mono); color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 600;
  padding: 12px 22px; border-radius: 10px; cursor: pointer; transition: opacity .15s, border-color .15s, transform .05s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, #3B82F6, #7C5CFC); color: #fff; box-shadow: 0 8px 30px rgba(59,130,246,0.22); }
.btn-primary:hover { opacity: 0.92; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--blue); }

/* Sections */
.section { padding: 56px 0; }
.section-alt { background: var(--surface2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }
.section-sub { color: var(--muted); margin: 8px 0 28px; font-size: 15px; }

/* Downloads */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 760px) { .dl-grid { grid-template-columns: 1fr; } }
.dl-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 22px 20px;
  display: flex; flex-direction: column; gap: 6px; transition: border-color .15s, transform .1s;
}
.dl-card.current { border-color: var(--blue); box-shadow: 0 0 0 1px var(--blue), 0 14px 40px rgba(59,130,246,0.12); }
.dl-os { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; }
.dl-os svg { color: var(--text); }
.dl-meta { font-size: 12.5px; color: var(--muted); min-height: 18px; }
.dl-badge { align-self: flex-start; font-size: 10.5px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--blue); background: rgba(59,130,246,0.12); border-radius: 999px; padding: 2px 9px; margin-top: 2px; }
.dl-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; }
.dl-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 14px; border-radius: 9px; font-size: 13.5px; font-weight: 600;
  border: 1px solid var(--border); background: transparent; color: var(--text); transition: border-color .15s, background .15s;
}
.dl-btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.dl-btn:hover { border-color: var(--blue); }
.dl-sub { font-size: 12px; color: var(--muted); text-align: center; }
.dl-disclaimer { margin-top: 18px; font-size: 13px; color: var(--muted); }

/* Callout + code */
.callout { margin-top: 28px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 22px; }
.callout-title { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.callout p { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.code {
  background: #060910; border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px;
  overflow-x: auto; font-family: var(--mono); font-size: 13px; line-height: 1.7; color: #CBD5E1;
}
.code code { white-space: pre; }

/* Trust grid */
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 880px) { .trust-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .trust-grid { grid-template-columns: 1fr; } }
.trust-item { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.trust-icon { color: var(--green); font-size: 13px; margin-bottom: 8px; }
.trust-item h3 { font-size: 14.5px; font-weight: 600; margin-bottom: 6px; }
.trust-item p { font-size: 13px; color: var(--muted); }

/* Steps */
.steps { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.step-title { font-size: 15px; font-weight: 600; margin-bottom: 10px; }
.step-note { font-size: 13px; color: var(--muted); margin-top: 8px; }

/* Guides */
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 880px) { .guide-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .guide-grid { grid-template-columns: 1fr; } }
.guide-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px;
  transition: border-color .15s, transform .1s; display: block;
}
.guide-card:hover { border-color: var(--blue); transform: translateY(-2px); }
.guide-kicker { font-family: var(--mono); font-size: 11.5px; color: var(--blue); margin-bottom: 8px; }
.guide-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.guide-card p { font-size: 13px; color: var(--muted); }
.guides-foot { margin-top: 22px; font-size: 13.5px; color: var(--muted); }
.guides-foot a { color: var(--blue); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 26px 0 44px; }
.footer-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--muted); }
.footer-links a:hover { color: var(--text); }
.footer-note { font-size: 12.5px; font-family: var(--mono); color: var(--muted); }